Blogk-presser for wood-paper-pulp machines



(No Model.)

N. H. BROKAW. BLOCK PRESSER FOR WOOD PAPER PULP MACHINES. No. 271,409; Patented Jan.30, 1883.

INVENTOR BY 2 @Q ATTORNEYS.

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NORMAN l]. BROKAW, ()F MARINETIE, WISCONSIN.

BLOCK-PRESSER FOR WOOD-PAPER-PULP MACHINES.

SPECIFICATION forming part of Letters Patent No. 271,409, dated January 30, 1883.

Application filed June 8, 1882.

To all whom it may concern Be it known that I, NORMAN H. BROKAW, of Marinette, in the county of Marinette and State of Wisconsin, have invented a new and Improved Block-Presser for WVood-Paper-Pul p Machines, of which the following is a full, clear, and exact description.

The object of my invention is to provide a new and improved device for pressing the blocks of wood upon the grinding or abrading surface of a paper-pulp machine.

The invention consists in a head-block attached to the lower end of a piston-rod attached to a piston in a cylinder having its ends connected at opposite sides by tubes containing three-way cocks provided with arms connected by suitable arms with levers pivoted on the topof the cylinder and having their outer ends weighted, and having their inner ends adapted to be held by a latch connected by a suitable device with the head-block, whereby when compressed air, steam, or a liquid is admitted in the cylinder the head-block will be moved downward, and will press the block of wood on the grinding-surface, and when this head-block has descended sufficiently the latch is opened, the inner ends of the levers are released, the cocks are reversed, and the piston and head-block will be raised.

Reference is to be had to the accompanying drawing, forming part of this specification, in which a longitudinal sectional elevation of my improved block-presser is shown.

The cylinder A, closed at the top and bottom, contains a piston, B, to which a rod, 0, is attached, projecting from the lower end of the piston, to the lower end of which pistonrod an ordinary head-block, D, is attached. The ends of the cylinder A are connected at opposite sides by tubes E E, each provided in the middle with a three-way cock, F or F, at which cock outlet and supply pipes G G are connected with the tubes E E, respectively. To the cooks F F arms H H are attached, and the outer ends of these arms are connected by rods I I with the outer ends of levers J J,

pivoted on the top of the cylinder, which levers have weights K K mounted on the outer ends. The inner ends of the levers J J are (No model.)

adapted to meet and to pass under a latch, L, on the top of the cylinder, which latch is connected by a chain or cord, M, with the head block D. The block of woodNis held between the grinder O and the head-block D.

The operation is as follows: It the piston B is raised, as shown, the cock F will be open and the cock F closed-that is, the water can only enter the cylinder at the upper end of the tube E and only leave the cylinder at thelower end of the tube E. The outer ends of the levers J J will be raised and the inner ends will be lowered and held under the latch It. The water forces the piston 13 downward and presses the block of wood N upon the grinding-surface. When the head-block has descended as much as desired-that is, when the entire block has been ground to fiber-the chain M, which is so adjusted that it will then be drawn taut, acts on the latch L and releases the inner ends of the levers'J J. The weights K K on these levers draw the outer ends of those levers downward and operate the cocks, whereby the cock F will be opened and the cock F will be closed, so that the water can only enter at the lower end of the tube E and must pass oft at the upper end of the tube E-that is, the piston will be raised. Then the inner ends of the levers J J are lowered and locked by means of the latch L, so that the water can enter, as described above, and the piston will be lowered again.

In place of water, oil, alcohol, or any other liquid or gases, vapors, compressed air, or steam maybe used to operate the block-presser.

This mechanism is very simple, is reversed automatically, andalways exerts a uniform pressure on the block.

A projection, B, is provided both on the upper and lower surface of the piston, and these projections prevent the piston from being raised or lowered sufficiently to close the end of the tubes E E.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. Ina block-presser for pulp-mills, the combination, with the cylinder A, of the tubes E E, connecting the ends of the cylinder, the

a device for oonneotingthe piston-rod or headblocl; with the latch L, substantially as herein 10 shown and described, and for the purpose set forth.

three-way cocks F F, the piston 13, and the rod (J, substantially as herein shown and described, and for the purpose set forth.

2. In a block-presser, the combination, with the cylinder A, of the tubes E E, the three way cocks F F, the arms H H, the rods I I, the levers J J, tl e weights K K, the latch L, the piston 13, therotl O, the head-block D, and l NORMAN H. BROKAW. \Vitnesses:

WM. S. BAKER, II. J. BROWN. 

